US2813214A - Cathode-ray tube for image reproduction - Google Patents

Cathode-ray tube for image reproduction Download PDF

Info

Publication number
US2813214A
US2813214A US479939A US47993955A US2813214A US 2813214 A US2813214 A US 2813214A US 479939 A US479939 A US 479939A US 47993955 A US47993955 A US 47993955A US 2813214 A US2813214 A US 2813214A
Authority
US
United States
Prior art keywords
wires
grid
grids
cathode
ray tube
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US479939A
Other languages
English (en)
Inventor
Adrian Gerard Van Doorn
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
US Philips Corp
North American Philips Co Inc
Original Assignee
US Philips Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by US Philips Corp filed Critical US Philips Corp
Application granted granted Critical
Publication of US2813214A publication Critical patent/US2813214A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/16—Picture reproducers using cathode ray tubes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J19/00—Details of vacuum tubes of the types covered by group H01J21/00
    • H01J19/28—Non-electron-emitting electrodes; Screens
    • H01J19/38—Control electrodes, e.g. grid
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
    • H01J29/80—Arrangements for controlling the ray or beam after passing the main deflection system, e.g. for post-acceleration or post-concentration, for colour switching
    • H01J29/803—Arrangements for controlling the ray or beam after passing the main deflection system, e.g. for post-acceleration or post-concentration, for colour switching for post-acceleration or post-deflection, e.g. for colour switching
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2893/00—Discharge tubes and lamps
    • H01J2893/0001—Electrodes and electrode systems suitable for discharge tubes or lamps
    • H01J2893/0012—Constructional arrangements
    • H01J2893/0015—Non-sealed electrodes

Definitions

  • the invention relates to a cathode-ray tube, more particularly for the reproduction of coloured television images, the tube comprising acollecting screen, on which an image is drawn, and two grids arranged at a small distance from this screen.
  • cathode-ray tubes which comprise a collecting screen, for example a luminescent screen, on which an image is drawn, these tubes comprising in front of this screen, i. e. on the cathode side thereof, two grids which lie practically in one plane and which have exclusively parallel wires lying in this plane in a manner such that the wires of the two grids alternate with one another.
  • Such tubes have been particularly constructed for use in devices for the reproduction of coloured television images. With the aid of such grids t the image may have a line structure and by a suitable construction of the luminescent screen, for example with alternating strips of materials luminescing in different colours, a colour image may be reproduced.
  • Such tubes have furthermore been suggested for the reproduction of stereoscopic images.
  • the invention has for its object to provide the same condition for the two extreme wires as for the further wires of the grids.
  • a cathode-ray tube more particularly a tube for the reproduction of coloured television images, comprises a collecting screen, on which an image is drawn and two grids located at a small distance in front thereof, and having exclusively parallel, thin wires lying in a plane substantially parallel to the collecting screen, in a manner such that the wires of the grids alternate with one another, and is characterised in that parallel to each extreme grid wire, spaced apart therefrom by a distance equal to the distance between this Wire and the adjacent wire, provision is made of a rigid, conductive part lying substantially in the plane of the grids and connected electrically to the last-mentioned wire.
  • the extreme thin wires of the grids lie between two conductive parts which are always at the same potential.
  • the rigid, conductive part may, for example, be a grid wire of a thickness such that it is no longer liable to bend.
  • a conductive strip for example of metal may be used. This strip may for example be at right angles to the plane of the grids.
  • the rigid, conductive part is constituted by the side of a frame, on which the grid wires of one grid are mounted.
  • FIG. 1 shows diagrammatically the construction of a cathode-ray tube according to the invention and Figs. 2, 3, 4, 5 and 6 show more in detail the relative positions of the grids, the grid wires and the aforesaid rigid, conductive parts.
  • the envelope of the cathode-ray tube is constituted by a cylindrical part 1 and a conical part 2, secured thereto and sealed by a substantially flat window 3.
  • Reference numeral 4 designates the electron gun, and numerals 5 and 6 designate a focusing coil and a deflection coil system respectively.
  • On the window 3 provision is made of a luminescent screen 7, in front of which two grids 8 and 9 are arranged, the wires of which lie in one plane which is substantially parallel to the surface 7 and alternate with one another.
  • Fig. 2 shows the course of the grid wires and their connection in a tube as shown in Fig. 1.
  • the grids are secured to conductive strips 10 and 11, 12 and 13 respectively.
  • a high voltage which is variable, is applied between these strips and hence between the grid wires.
  • electro-static forces are exerted on the wires secured to the strips 10 and 12 owing to the provision of the wires secured to the strips 11 and 13.
  • the wires secured to the strips 10 and 12 will not deviate in the plane of the grids, since they are flanked on either side by the wires secured to the strips 11 and 13.
  • Fig. 3 shows a slightly modified construction, in which the wires of one grid are mounted on a frame 22. From the sectional view of this construction shown in Fig. 4 it is evident that the side of the frame 22 constitutes the rigid, conductive part, as referred to above.
  • the frame may for example be provided with upright edges on the sides flanking the grid Wires.
  • Such an embodiment is shown diagrammatically in Fig. 5, in which the frame is designated by 23, the upright edges by 24 and 25.
  • Fig. 6 shows a further construction of the grid system, in which the two extreme wires do not belong to the same grid.
  • the wires of one grid are secured on the one hand to the straight strip 27 and on the other hand to a strip 28 bent at right angles.
  • the wires of the other grid are secured to a straight strip 29 and a bent strip 30.
  • the extreme wires 31 and 32 are flanked by a grid wire and part of the strips bent at right angles, which are at the same potential during operation as the wires 33 and 34. Thus the wires 31 and 32 are prevented from bending.
  • a cathode-ray tube including a screen for producing color television images, said tube including a pair of electrically-separated grids located in front of the screen and each comprising electrically-connected, parallel, thin wires subject to movement when exposed to an electrostatic field and all of the wires of both grids lying substantially in one plane, the wires of said pair of grids being alternately arranged so that each wire of one grid lies between wires of the other grid, except for the two grid wires at the.
  • the improvement comprising the provision of rigid, substantially immovable, conductive members mounted parallel and adjacent to said two grid wires at the opposite ends and on the side thereof remote from the other grid wires, said conductive members lyingsubstantially in the same plane as the grid wires and being spaced from the end grid wires a distance substantially the same as said given distance, each of said conductive members being electrically connected to the grid wire adjacent said grid wire at the end of the grid, whereby said end grid wires are subjected to substantially the same electrostatic field from opposite sides when different potentials are applied to the different grids and are thus prevented from undergoing appreciable movement.

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
US479939A 1954-02-23 1955-01-05 Cathode-ray tube for image reproduction Expired - Lifetime US2813214A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL185327A NL93773C (OSRAM) 1954-02-23 1954-02-23

Publications (1)

Publication Number Publication Date
US2813214A true US2813214A (en) 1957-11-12

Family

ID=19750652

Family Applications (1)

Application Number Title Priority Date Filing Date
US479939A Expired - Lifetime US2813214A (en) 1954-02-23 1955-01-05 Cathode-ray tube for image reproduction

Country Status (7)

Country Link
US (1) US2813214A (OSRAM)
BE (1) BE535893A (OSRAM)
CH (1) CH328925A (OSRAM)
DE (2) DE1732539U (OSRAM)
FR (1) FR1119488A (OSRAM)
GB (1) GB777757A (OSRAM)
NL (2) NL93773C (OSRAM)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4150319A (en) * 1977-09-22 1979-04-17 The Bendix Corporation Ion gating grid

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH078580B2 (ja) * 1988-10-21 1995-02-01 双葉電子工業株式会社 蛍光プリンタヘッド

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2692532A (en) * 1951-04-04 1954-10-26 Chromatic Television Lab Inc Cathode ray focusing apparatus

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2692532A (en) * 1951-04-04 1954-10-26 Chromatic Television Lab Inc Cathode ray focusing apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4150319A (en) * 1977-09-22 1979-04-17 The Bendix Corporation Ion gating grid

Also Published As

Publication number Publication date
NL93773C (OSRAM) 1960-04-19
NL185327B (nl)
BE535893A (OSRAM)
GB777757A (en) 1957-06-26
FR1119488A (fr) 1956-06-20
DE948701C (de) 1956-09-06
CH328925A (de) 1958-03-31
DE1732539U (de) 1956-10-25

Similar Documents

Publication Publication Date Title
US3408532A (en) Electron beam scanning device
US2449339A (en) Cathode-ray tube
US2858464A (en) Cathode ray tube
US4103204A (en) Flat display device with beam guide
US2695372A (en) Grid structure for cathode-ray tubes
US2890376A (en) Image producing discharge device
US2227087A (en) Cathode ray tube
US2813214A (en) Cathode-ray tube for image reproduction
US2803781A (en) Device comprising a cathode-ray tube
US3295010A (en) Image dissector with field mesh near photocathode
US2523406A (en) Insulated anode for cathode-ray tubes
US3182221A (en) Secondary emission multiplier structure
US2228958A (en) Cathode ray tube
US2213175A (en) Television transmitting tube and system
US3432711A (en) Hybrid deflection image dissector having concave deflection plates converging at horizontal edges of resolving apertures
US2701847A (en) Color television tube structure
GB787409A (en) Improvements in or relating to cathode-ray tubes for the reproduction of colour television images
US2796546A (en) Damp rod construction for cathode ray tube grid structure
JPS5913138B2 (ja) 表示装置
US2729760A (en) Electrode structure for cathode-ray tubes for image production in natural color
US2319811A (en) Cathode ray tube
US2887600A (en) Electron gun structure
US3277334A (en) Charge storage tube and target electrode therefor
US2743391A (en) Cathode ray tube
US2793317A (en) Electron focusing structure